<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <div v-show="flag">我是v-show控制盒子</div>
      <div v-if="flag">我是v-if控制盒子</div>
      <div v-else>我是v-else控制盒子</div>
    </div>

    <script src="../js/vue.js"></script>
    <script>
      var app = new Vue({
        el: "#app",
        data: {
          flag: false,
        },
      });
    </script>
  </body>
</html>
